<?php
$url = 'https://product-search.api.cj.com/v2/product-search?website-id=12345678keywords=GPS&serviceable-area=US';
$CJ_KEY = 'your_developer_key_here';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, FAlSE);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: '.$CJ_KEY));
$curl_results = curl_exec($ch);

$returnXML = simplexml_load_string($curl_results);
var_dump($returnXML);
?>